Merge branch 'stable-3.6'

* stable-3.6:
  Generate default password during the plugin's init step
  Encrypt oauth token at rest
  Remove test dependencies
  Remove unused GITHUB_GET_USER variable
  Remove unused constructor argument
  Bump Apache Velocity to 2.3

Change-Id: I68e9dc2607c036eb83f95af62ba205539bdb89fe